Pump



Oct.-30, 1928.

J. W. WOODRUFF PUMP Filed Nov. 19, 1925 ATTORNEYS Patented Oct. 30, 1928.

UNITED STATES 1,689,269 PATENT OFFICE.

JOSEPH W. WOODRUFF, F ELIZABETH, NEW JERSEY.

.p PUMP.

Application led November 19, 1925. Serial No. 70,013.

for removing heavy or unusually viscous oils or greases from barrels or other containers.

One object of the invention is to provide a pump of the character described embodying novel and improved features of construction whereby unusually viscous greases, oils or other heavy or thick liquids may be'easily and effectively pumped from a container.

Another object is to provide such a pump embodying novel and improved features of construction whereby a maximum of pumping power is obtained with a minimum eX- penditure of energy in operating the pump.

Further objects are to provide a pump of this character which is simple and inexpensive in construction and operation and will not easily get out of repair; to thus provide a pump formed in general of substantially straight tubes or pipes concentrically arranged and having sliding fits with each other; to provide in such a pump novel and improved valve means, and to obtain other results and advantages as may be brought out by the following description.

Referring to the accompanying drawing, in which corresponding and like parts are designated throughout the several views by the same reference characters, y

Figure l is a vertical longitudinal sectional view through a pump embodying the invention, showing the piston at the limit of its liquid ejecting stroke;

Figure 2 is a fragmentary vertical sectional view vof: the inlet end of the pump showing the piston at the limit of its intake stroke;

Figure 3 is a horizontal sectional view, taken on the line 3--3 of Figure l, and

Figure 4 is a fragmentary side elevation of the inlet end of the pump with the parts in the positions shown in Figure l.

Specifically describing the present embodiment of the invention, the reference character l designates the cylinder of the pump which is preferably formed of a straight tube and has one end lclosed as at 2 in any suitable manner, for instance bv a screw plug. Intermediate its ends the cylinder l is provided with a pluralityof transverse openings 3 in its walls disposed in substantially the same transverse plane, said openings serving as inlets for the pump cylinder.

The piston of the pump includes a piston sleeve 4 and an outlet and operating tube or plunger 5. The piston sleeve 4 which'is also preferably formed of a straight tube is reciprocable within the cylinder l and has a sliding fit therewith, said sleeve preferably being shorter than the cylinder 1. The sleeve 4 is provided with a plurality lof slots 6 spaced from one end of the sleeve and of a length sufficient to maintain communication of said slots with the openings 3 in the cyliiider when the sleeve is resting upon the closed end 2 of the cylinder, as shown in Figure l.

The tube 5 is recprocable within the sleeve 4 and has a sliding fit therewith,said tube extending the full length of the cylinder and beyond the open end thereof, as shown in Figure l.. The outer end of the tube serves as the outletof the pump and may be connected in any suitable manner to the point to which it is desired to pump the liquid being handled. For most purposes, a spout 7 may be connected to the tube 5, as shown on the drawings. The inner end of the tube 5 is provided with a valve seat 8 with which cooperates a ball check valve 9, and the tube 5 is so arranged as to open and close the slots 6 in the sleeve 4 to permit the flow of liquid through the openings 3 in the cylinder and theslot 6 into the lowerend of the cylinder and cause said liquid to be ejected through the outlet tube, respectively. For this purpose, the tube 5 is capable of movement relatively to the sleeve 4, said movement bein limited in the direction of the outward stroke of the tube 5 by a` transverse pin lOin the tube movable in the slots 6 of the sleeve, the

movement being limited in the other direction bv engagement of a collar l1 fast on the tube 5 with the outer end ofthe sleeve 4.

In operation of the pump, thecylinder is inserted into the container from which the liquid is to be pumped, for instance through the bung hole of a barrel containing oil, and the tube 5 drawn outwardly of the cylinder 1 into substantially the positionshown in Figure 2. The'oil in the barrel or like container flows through the openings 3 and slots 6 beneath the innerV end ofthe tube 5 into the lower end of the cylinder. `The tube 5 is then forced inwardly of the cylinder and initially moves independently of the sleeve 4 so as to close the slots 6, after which the collar 1l strikes the upper end of the sleeve 4 and the sleeve and tube 5' lmove together. The ball valve 9 is opened by the pressure of the liquid in the lower end of the cylinder, and the liquid is forced outwardly through the tube 5 and spout 7. As the tube 5 is next pulled outwardly of the cylinder the check valve 8, 9 closes, and the tube first moves independently of the sleeve l to open the slots t3 until the pin 10 strikes the upper ends of said slots,

after which the tube 5 and sleeve 4L' move to! gether tothe position shown in Figure 2,

liquid predetermined by the capacity of the portion of the cylinder below the openings 3. Preferably, a bearing sleeve l2 is fitted in the outer end of the cylinder' to guide the tube 5 and also to close the cylinder.

Any suitable meansmay be 'provided for reciprocating the piston of the pump, but for `the purposes of illustration l have shown a lever 13 pivoted at one end as at 14; to a bracket 15 secured to the outer end of the cylinder 1, said lever having a pin and slot connection 16with a collar 17 fast upon the outer end of the tube 5. Obviously, oscillation of the lever 13 will cause reciprocation 0f the tube 5. 4

It will be noted that the parts of the pump are extremely simple and strong so that a maximum pumping power for ejecting the liquid through the outlet tube 5 is obtained with a minimum, expenditure of energy on the lever 13. There are no complicated valves to get out of ordernor are there any sockets or small ports or passages to retard the passage of a heavy liquid `through the pump. The main valve, that is the inner end of the tube 5 cooperating with the slots 6 in the sleeve 4, is simple and positively operated directly through the tube 5 and by the same power which operates the piston of the pump. The effectivearea of the piston, that is that area provided by the end of the sleeve a and the inner end of the tube 5, is relatively small in comparison with the cross-sectional area Aof the outlet passage through the tube 5.

Vhile I have shown and described the pump as embodying certain details of construction, it will be understood that this is primarily for the purpose of illustrating the principles of the invention and that many modifications and changes can be made in these details without departingV from the spirit or scope of the invention. Therefore,

l do not desire to be understood as limitingv myself except as required by the following claims when construed in the light of the prior art. f

Having thus described the invention, what I claim is:

l. A pump comprising a cylinder closed at one end and having an inlet opening in spaced relation to said closed end, a piston sleeve forriied of a substantially straight tube reciprocable in said cylinder and having a sliding lit therewith, said sleeve having a slot spaced from the inner end thereof to establish communication between said inlet opening and the passage through ysaid sleeve, a substantially straight outlet and operating tube slidably fitting within said piston sleeve to open and close communication through said slot, said outlet tube having a valve seat at its inner end facing inwardly of said tube, a check valve cooperating with saidseat to permit flow of fluid from said cylinder into said tube, means connecting said piston sleeve and said outlet tube to permit limited movement of said tube relatively to said piston sleeve in opposite directions to open and close said slot and to cause movement of said sleeve with said tube after said slot has been opened or closed, and means for reciprocating said outlet tube. 1

2. A pump comprising a cylinder closed at one end and having an inlet opening in spaced relation to said closed end, a tubular 'piston sleeve reciprocable in said cylinder and having a sliding fit therewith, said sleeve having a slot spaced from the inner end thereof to establish communication between said inlet opening and the passage through said sleeve, an outlet and operating tube slidably fitting within said piston sleeve to open and close communication through said slot and having a check valve to permit flow of fluid from said Y cylinder into said tube, a pin projecting from said outlet tube and movable in said slot to i permit movement of said tube relatively to said piston sleeve to open said slot and to cause said sleeve to move with said tube after said slot has been opened, and means fast to said outlet tube to engage said sleeve so as to permit movement of said tube relative to said sleeve to close said slot and to cause said sleeve to move with saidoutlet tube after said slot has been closed, and means for reciprocating said outlet tube.

3. In a pump, a cylinder closed at one end and having an inlet in spaced relation to said closed end, a plunger in said cylinder having a longitudinal channel opening into said closed end of the cylinder, an outwardly opening` valve in said channel, and a sleeve slidable upon said plunger and in said cylinder, said sleeve having a slot to permit communication between said inlet and the closed end of said cylinder, communication through said slot being opened and closed by relative movement of said sleeve and said plunger upon opposite strokes of the plunger respectively.

4. A pump comprising a cylinder closed at one end and having an inlet opening in spaced relation to said closed end, a tubular piston sleeve reciprocable in said cylinder and having a sliding lit therewith, said rsleeve having a slot spaced from the inner end thereof to establish communication between said inlet opening and the passage throu h said sleeve, a plunger having a longitudina chan- 10 nel therethrough slidably fitting Within said piston sleeve to open and close communication through said slot, a check valve to permit flow of uid from said cylinder into said plunger, means connecting said piston sleeve and said plunger to permit limited movement of said plunger relatively to' said piston sleeve in opposite directions to open and close communication through said slot and to cause movement of said sleeve With said plunger after such communication has been 20 opened or closed.

JOSEPH W. WOODRUFF. 

